物流各环节中最关键的环节是( )。A．储存 B．包装 C．装卸 D．运输

Most plants can make their own food from sunlight, (1) some have discovered that stealing is an easier way to live. Thousands of plant species get by (2) photosynthesizing, and over 400 of these species seem to live by pilfering sugars from an underground (3) of fungi(真菌). But in (4) a handful of these plants has this modus operandi been traced to a relatively obscure fungus. To find out how (5) are (6) , mycologist Martin Bidartondo of the University of California at Berkeley and his team looked in their roots. What they found were (7) of a common type of fungus, so (8) that it is found in nearly 70 percent of all plants. The presence of this common fungus in these plants not only (9) at how they survive, says Bidartondo, but also suggests that many ordinary plants might prosper from a little looting, too.

Plants have (10) relations to get what they need to survive. Normal, (11) plants can make their own carbohydrates through photosynthesis, but they still need minerals. Most plants have (12) a symbiotic relationship with a (13) network of what are called my corrhizal fungi, which lies beneath the forest (14) . The fungi help green plants absorb minerals through their roots, and (15) , the plants normally (16) the fungi with sugars, or carbon with a number of plants sharing the same fungal web, it was perhaps (17) that a few cheaters—dubbed epiparasites—would evolve to beat the system. (18) , these plants reversed the flow of carbon, (19) it into their roots from the fungi (20) releasing it as "payment.\

16（）

A.offer

B.equip

C.help

D.provide

目标公司在收购威胁下大量增加自身负债，降低企业被收购的吸引力的反收购策略是( )。

A．负债毒丸计划
B．金降落伞策略
C．白衣骑士策略
D．股票交易策略

抢篮板球技术由（）、（）、（）、或（）四个环节组成。

民事法律行为与其他民事行为最根本的区别在于（）。

A.有效性

B.合法性

C.补偿性

D.专属性

汽车维修企业是指从事（），为车主提供服务（）的（）。